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关键词： Stiffness  

摘要： The objective of this study is to propose abbreviated calculation methods on yield strength and initial stiffness for Multi-layered plywood (MLP) connection using drift pinned joint with steel inserted plate. Exact calculated values of yield strength and abbreviated calculated values of it were compared, and did the same with initial stiffness, and it was shown that there was little difference between them. Connection tests were conducted, and abbreviated yield strength was close to experimental values;therefore, its validity was confirmed. Regarding initial stiffness, abbreviated value was matched to some degree to experimental values;however, there is still room for improvement. © 2025 Architectural Institute of Japan. All rights reserved.

关键词： Trusses  

摘要： Experiments were conducted to evaluate the withdrawal performance of screwed joints for diagonal beam fastening structures at the joints between diagonal beams and beams, which serve as tensile members in truss structures used in wooden buildings with large spaces. In the experiment, the angle of the diagonal beam, the angle of the screw, the length of the screw, and the direction of the screw were used as parameters. The experimental results were in general agreement with the calculation results using the proposed formula for inclined screw withdrawal strength. © 2025 Architectural Institute of Japan. All rights reserved.

关键词： Wooden buildings  

摘要： The authors have previously proposed a calculation method to reproduce the mechanical behavior of the joints in CLT rocking frames as a damage control technology for mid- to high-rise wooden buildings. However, there are issues such as the model used for the evaluation may differ from the actual behavior, and the embedded stiffness at the contact area between the column and beam was calculated based on predictions from other literature. Therefore, the goal of this research is to understand the mechanical behavior of the column-beam joints of CLT rocking structures and repropose an evaluation method. © 2025 Architectural Institute of Japan. All rights reserved.

关键词： Struts  

摘要： In this study, the joint shear strength is discussed on reinforced concrete column-beam joints with different floor levels on beams (stepped beam joint). 1) Compared to a normal interior joint, the stress transfer in the stepped beam joint is more complicated, making it difficult to properly evaluate the shear strength of the joint using the AIJ toughness guideline formula. 2) The shear strength of stepped beam joints can be reasonably evaluated based on a split strut mechanism that takes into account the presence of steps and the effect of the anchorage type of the beam reinforcement. © 2025 Architectural Institute of Japan. All rights reserved.

关键词： 聚能射流   虚拟原点   量纲分析   动态试验   有限元模拟  

摘要： 为研究受横向扰动下聚能射流侵彻威力的变化规律，建立聚能射流动态侵彻的有限元模型，分析由静态向动态条件的射流侵彻过程的演化过程。基于虚拟原点理论和量纲分析方法，引入虚拟源在量纲分析模型中对射流进行表征。建立考虑横向扰动、射流和靶板强度的射流动态侵彻深度的工程化预测模型。设计并开展基于火箭滑车的射流动态侵彻试验，对数值模拟及预测模型进行验证。研究结果表明，射流动态侵彻深度随靶板横向扰动的增加而指数型下降；数值模拟、预测模型及试验结果之间吻合较好，预测模型和数值模拟均具备一定的准确和有效性，新建立的预测模型能够将横向扰动对聚能射流侵彻威力的影响进行描述，为评价成型装药动态毁伤威力提供依据和参考。

关键词： 对称型折板式竖井   折板倾角   数值模拟   水力特性   消能率  

摘要： 在全球气候变暖，城镇化率升高的背景下，极端暴雨对现有的城市排水系统带来了巨大的挑战。为应对城市内涝，深层隧道排水系统被越来越多的应用于大型城市中，而入流竖井是该排水系统重要的组成部分。为分析折板倾角对深隧入流对称型折板式竖井水力特性的影响，本文基于Realizable k–ε模型和VOF方法建立了三维紊流数学模型，分别对折板倾角为0°、8°、10°和12°的竖井进行数值模拟，得到无量纲流量(Q*)为0.056～0.168时，竖井的水流流态、流速分布、压强分布和竖井消能率。结果表明，随着折板倾角的增大，水流流态呈现撞壁受限流-临界流-自由跌流的转变，折板间壅水高度减小，气体占比上升，泄流量增加；水流在折板间摆动幅度减小，掺混程度减弱，导致折板前缘水流流速增加。竖井壁面压强主要由静水压强和动水压强组成，静水压强是主要影响因素，随着倾角增加，压强随之减小。折板倾角对竖井消能率的影响随流量发生变化，大流量泄流工况下竖井的消能率要低于小流量工况。小流量泄流时，水流直接跌落在折板上，消能率随折板倾角的增大而减小；大流量泄流时，水流直冲对侧井壁，消能效果降低，故折板倾角增加，消能率先增大后减小。研究成果可为深隧工程中的竖井折板倾角的设计提供参考。

关键词： 水库工程   混凝土防渗墙   坝下涵管   施工设计  

摘要： 为解决水库工程除险加固施工期间存在的施工设计问题,以防渗墙穿坝下涵管为例,结合实际工程案例,先对工程概况以及施工设计方案做出分析.在此基础上,研究防渗墙施工技术要点,并对不同的施工设计方案进行对比,从中优选出最为合理的设计方案,以期为相关人员提供参考.

关键词： 速凝材料   水玻璃   粘度时变性   浆液扩散距离  

摘要： 高压旋喷技术在水利工程、基础工程、地下工程、深基坑工程中应用广泛。然而在粉砂土地层条件下，由于土颗粒的黏聚力差，采用常规水泥基固化剂进行施工时，浆液在高喷浆压力下难以聚集、极易流失，导致旋喷桩施工质量差。针对上述问题研发高效的速凝材料，使得浆液快速凝结固化，解决粉砂土地层中浆液难以聚集的问题。研究基于高压旋喷侵蚀理论模型，提出考虑黏度时变性的浆液扩散距离计算方法，并对不同配比下的水泥–水玻璃浆液开展黏度试验，研究了各组别黏度随时间变化规律，在考虑凝胶时间、材料强度及浆液扩散距离的前提下，综合优化了粉砂土地层下水泥–水玻璃速凝材料配比，最终给出粉砂土地层水泥–水玻璃浆液推荐配比为水灰质量比1.0～1.2，体积比为1∶0.1。本研究对于速凝浆液在高压旋喷法中的理论分析及工程配比优化具有参考意义。

关键词： 水利工程   隧洞   喷锚支护   衬砌加固   技术  

摘要： 水利工程隧洞的运行过程相较于其他类型的隧洞更为复杂,这就需要采用多种加固手段进行加固处理来确保其稳定运行。本文依托实际工程案例,对水利工程隧洞加固工程予以简要阐述,在此基础上,深入分析隧洞衬砌技术和喷锚支护施工技术的应用关键要点,针对不同洞身围岩的地质特性与属性差异,运用不同的强化加固技术,切实提高水利隧洞围岩的整体稳定性,有效延长其使用年限,确保了水利设施的安全与持久运行,期望能为其他相似的水利工程项目提供经验参考。