Seismic Behavior and Design of Double-Tee Panel Precast Systems

9412906平切拉预制构件使用双T型构件在美国各地的停车场、商业和工业建筑中很常见，并因其被证明有效和经济而取得了广泛的成功。双T形三通被用作墙壁和隔膜。不幸的是，这些系统主要是为了抵抗垂直负载而开发的。该国的新地区最近被指定为地震活跃地区，建筑法规收紧了抗震设计要求。这些变化使人们对预制结构体系的使用和能力产生了怀疑，而缺乏全面的相反证据可能会导致未来规范要求的更保守的设计。该项目的目标是为薄混凝土翼缘之间的连接能力建立一个经过验证的物理基础，例如用作墙板或横隔板的双T形三通之间的连接，以改进抗震设计方法。为了实现这一目标，将进行广泛的循环连接试验。节点试验结果将被用来发展非线性分析方法，并建议修改规范，例如：合理选择翼缘或横隔板厚度和顶部厚度的方法，预制双T形剪力墙合适的荷载降低系数的估计方法，构件之间延性翼缘连接的设计步骤，以及显示预制预应力横隔板和墙体的非线性设计程序的实例。这是一个PRESS项目。***

9412906 Pincheira Precast construction using double-Tee members is common in parking garages, commercial and industrial buildings across the United States and has had wide success because of its proven efficiency an economy. the double-Tee's are used as walls and diaphragms. Unfortunately the systems were developed primarily for vertical load resistance. New areas of the country have recently been designated as seismically active and building codes have tightened their seismic design requirements. These changes have cast doubt on the use and capacity of precast structural systems, and lack of thorough evidence to the contrary will likely result in more conservative design required by future codes. The goal of this project to establish a proven physical basis for connection capacities between thin concrete flange sections such as joint between double-Tee's used as wall or diaphragm panels to improve design methods for seismic resistance. To achieve the objective extensive cyclic connection testing will be carried out. The connection test results will be used to develop nonlinear analysis methods and to suggest code changes such as: rational methods of selecting flange or diaphragm thickness and topping thickness if needed, means of estimating appropriate load reduction factors for precast double-Tee shear walls, steps in designing ductile flange connections between members, and examples showing non linear design procedures for jointed precast prestressed diaphragms and walls. This is a PRESSS project. ***